to an .egg file to allow it to be run as a script on Unix-ish platforms.
(This is mainly so that setuptools itself can have a single-file installer
on Unix, without doing multiple downloads, dealing with firewalls, etc.)
(Backport from trunk)

--HG--
branch : setuptools-0.6
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/branches/setuptools-0.6%4051969